I took my Z out for a nice long run this evening and have noticed its only boosting up to 6psi. Over the winter I installed a front mount intercooler and have noticed when boosting at 6psi as soon as the throttle is released if I listen carefully I can hear air releasing (same noise as a dump valve only quieter) - it didnt make this noise before... Is this noise normal due to a larger intercooler and hard pipes? Or is something not right?

 

I have read the codes on the ecu half expecting to see code 34 but it read 55.

 

Where do I go from here? Boost leak test I guess?

 

Thanks, Dan

12v tyre compressor,

 

useless mate...will not give you the volume fast enough to cover the leak and also store at 5 psi. You need a LARGE fast imput of air from a tanked sorce to overcome leak losses while building to 5psi. Beg,steal or borrow a 240V tanked compresser and leaks will be found:winkiss:

Lol ok mate cheers, I will try get my hands on one at the weekend.

Pay me a visit if necessary, you can borrow my compressor , Sayers 07929 159828

Cheers mate, I have located a compressor and I will be using it Tuesday night.

 

 

 

 

Only Joking!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Lol cheers for that! What else is left other than to test for a leak? I put voltage to each boost solenoid, blew down and they click. So they're working...?

 

Thanks

You could apply air pressure to the wastegates to see if they open. However I think that's a going to be hard to see the drivers side, and b unlikely the cause. Have you done a boost leak test?

Ill tell you what to check because its just fooking happened to me. Get a proper vac test done on your actuators, my beloved POS would not boost above 14 PSI ( a little different i know but you are asking for suggestions) in my case 1 actuator was buggered and was opening at uber low PSI, the other was okay , however the sum total meant 1 blower was working its nuts off to reach 1 Bar

Fantastic, makes sense as the car boosts when the hose is off. I am also going to get hold of a mityvac and test them also. Thanks

Incase it is the actuator, are they servicable? If not, where can I buy then from?

 

Thanks

Im informed they are NOT servicable, get them from loving forum members, or try Garrett directly. beyond that i do not know

Ok, we have checked the actuators and both start open at 6/7psi. After performing the leak test we got a leak on the passenger side pipe that links the hard pipe upto the throttle body, to which we have temporarily repaired-so a I need to source one of those ASAP, also have a leak on the same side at the thread on the pcv valve. Nothing else seems to be leaking as of yet but can't pressurise until these have been fixed.

 

Thanks

The Pcv should seal by its own accord as the thread is tapered. Maybe it's slightly loose, worth a check, go gingerly it's threading into aluminium after all.

You have an air leak on one of the big 4 intercooler hoses? Am I reading that right?

Yes that's right, the end that clamps onto the throttle body has a very small tear in it, so I need to get a replacement, sort the pcv valve thread then retest. I understand then that this is looking to be the most likely cause of my boosting problems?

 

Thanks

To update, I am still after a replacement pipe. I have undone the PCV valve and re-installed but not yet leak tested. I have installed a different type of boost controller and I now have adjustable boost. I couldnt get the fist one I installed to give me anything above 6/7 psi.

1 actuator was buggered and was opening at uber low PSI, the other was okay , however the sum total meant 1 blower was working its nuts off to reach 1 Bar

 

Think you have misunderstood the workings of the turbo sytem there, whatever the actuators are doing the speed of the turbo's will be the same at any given rpm. So in your case the turbo with the actuator opening too early was doing the same amount of work as the other one, however the boost it was producing was not been fully contained in the system. The other turbo was doing the exact same amount of work but its boost was been contained within the system, think of them as air pumps both running from a single source ( exhaust gases ) neither one can run faster or work harder.

 

Jeff TT